Method drawLine

lib/GfxRenderer/GfxRenderer.cpp:497–537

}  // namespace

void GfxRenderer::drawLine(int x1, int y1, int x2, int y2, const bool state) const {
  if (fontCacheManager_ && fontCacheManager_->isScanning()) return;
  if (x1 == x2) {
    if (y2 < y1) {
      std::swap(y1, y2);
    }
    for (int y = y1; y <= y2; y++) {
      drawPixel(x1, y, state);
    }
  } else if (y1 == y2) {
    if (x2 < x1) {
      std::swap(x1, x2);
    }
    for (int x = x1; x <= x2; x++) {
      drawPixel(x, y1, state);
    }
  } else {
    // Bresenham's line algorithm — integer arithmetic only
    int dx = x2 - x1;
    int dy = y2 - y1;
    int sx = (dx > 0) ? 1 : -1;
    int sy = (dy > 0) ? 1 : -1;
    dx = sx * dx;  // abs
    dy = sy * dy;  // abs

    int err = dx - dy;
    while (true) {
      drawPixel(x1, y1, state);
      if (x1 == x2 && y1 == y2) break;
      int e2 = 2 * err;
      if (e2 > -dy) {
        err -= dy;
        x1 += sx;
      }
      if (e2 < dx) {
        err += dx;
        y1 += sy;
      }
    }
  }
}

void GfxRenderer::drawLine(int x1, int y1, int x2, int y2, const int lineWidth, const bool state) const {
  for (int i = 0; i < lineWidth; i++) {